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Which reagent used to test unsaturation ...

Which reagent used to test unsaturation of alkenes ?

A

conc . `H_2SO_4`

B

Solution of `Br_2` in `"CCl"_4`

C

Ammonical `Cu_2Cl_2`

D

Ammonical `AgNO_3`

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The correct Answer is:
B
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